2
   

How many photons will a molecule of water have when it turns into energy?

 
 
Reply Tue 10 Feb, 2015 11:33 am

Who knows this question about science?
  • Topic Stats
  • Top Replies
  • Link to this Topic
Type: Question • Score: 2 • Views: 970 • Replies: 7
No top replies

 
Frank Apisa
 
  2  
Reply Tue 10 Feb, 2015 12:10 pm
@oristarA,
oristarA wrote:


Who knows this question about science?



I know the question, Oristar. (It's right there!)

Not sure I understand it.

And I do not have a clue about its answer.
0 Replies
 
contrex
 
  1  
Reply Tue 10 Feb, 2015 12:39 pm
By what process could one convert water into energy?
0 Replies
 
Tryagain
 
  2  
Reply Tue 10 Feb, 2015 02:05 pm
1) calculate total energy to needed to melt ice
2) calculate energy per photon
3) calculate number of photons...

like this...

*** 1 ***
assuming all the photons are absorbed....
heat required to melt ice = energy of all the photons.
4.0x10^2 g x 334 J/g = energy of photons.
1.34x10^5 J = energy of photons.

*** 2 ***
then...for a single photon...
E = hc/L = 6.626x10^-34 J s x (3.00x10^8 m/s) / (660 nm x 1m/10^9nm) = 3.01x10^-19 J

ie... 3.01x10^-19 J/photon.

*** 3 ***
1.34x10^5 J x (1 photon / 3.01x10^-19J) = 4.4x10^23 photons


Therefore:


4.0x10^2 g x (1 mole / 18.0g) x (6.022x10^23 molecules / mole) = 1.34x10^25 molecules of water

then...
1.34x10^25 molecules of water / 4.4x10^23 photons = 30 molecules of water per photon.



By what process could one convert water into energy?”

Someday someone will invent a mill, steam engine or turbine.


contrex
 
  2  
Reply Tue 10 Feb, 2015 02:16 pm
@Tryagain,
Tryagain wrote:
By what process could one convert water into energy?”

Someday someone will invent a mill, steam engine or turbine.

Mills, steam engines and turbines do not convert water into energy.
oristarA
 
  0  
Reply Tue 10 Feb, 2015 11:11 pm
@contrex,
contrex wrote:

Tryagain wrote:
By what process could one convert water into energy?”

Someday someone will invent a mill, steam engine or turbine.

Mills, steam engines and turbines do not convert water into energy.



Yes you are correct that such converting would never happen.

To convert a molecule of water into photons, simply let it meet its antimolecule and both will be annihilated into photons (energy). Making antimatter is a frontier in particle physics.
0 Replies
 
oristarA
 
  0  
Reply Tue 10 Feb, 2015 11:19 pm
@Tryagain,
Tryagain wrote:

1) calculate total energy to needed to melt ice
2) calculate energy per photon
3) calculate number of photons...



Thank you for the reply.

But 1) is wrong. The correct calculation is to use Einstein's mass-energy equation: E = mc^2. The m in the equation refers to the mass of a molecule of water, c is speed of light and E is the total energy of the molecule.

Since your premise 1) is not correct, you got an erroneous result of the calculation.

I haven't found the data about the mass of a molecule of water.
0 Replies
 
raprap
 
  1  
Reply Wed 11 Feb, 2015 12:32 am
@oristarA,
Ignoring the second law of thermodynamics, equate the energy of fusion of water to hu, as in E=hu (Planc's law) and count your photons. Of course you'll have to define the frequency)

Rap
0 Replies
 
 

Related Topics

New Propulsion, the "EM Drive" - Question by TomTomBinks
The Science Thread - Discussion by Wilso
Why do people deny evolution? - Question by JimmyJ
Are we alone in the universe? - Discussion by Jpsy
Fake Science Journals - Discussion by rosborne979
Controvertial "Proof" of Multiverse! - Discussion by littlek
 
  1. Forums
  2. » How many photons will a molecule of water have when it turns into energy?
Copyright © 2021 MadLab, LLC :: Terms of Service :: Privacy Policy :: Page generated in 0.04 seconds on 12/08/2021 at 04:40:17